Vibrating Wire Strain Gauge
Rebar Straimeters (VW)
The Model 4911 Rebar Strainmeter is designed for measuring strains in foundations, slurry walls, precast piles, caissons, bridge abutments, tunnel liners, etc. The standard Model 4911 (#4 rebar), known as the “Sister Bar,” is installed alongside structural rebar. Larger models (4911A) are available for welding directly into structural rebar. Where short-term dynamic measurements are to be made, bonded resistance (Model 3911/3911A) strain gauges can be substituted, or added.
| Specifications | |
|---|---|
| Standard Range | 3000 µε |
| Resolution | 0.4 µε |
| Accuracy¹ | ±0.25% F.S. |
| Nonlinearity | <0.5% F.S. |
| Temperature Range² | −20 °C to +80 °C |
| Rebar Sizes | 4911 | #4 (Sister Bar)
4911A | #6, 7, 8, 9, 10, 11, 14 |
| Active Gauge Length | 4911 | 914 mm
4911A | 1105 mm |
¹Accuracy established under laboratory conditions.
²Other ranges available on request.